Finding the Fourth Proportional to 142,335.72, 196,433.46 and 78,672.24

Step by Step Solution

1. Step 1: Write the proportion equation
   142,335.72 : 196,433.46 = 78,672.24 : x
2. Step 2: Convert to fraction form
   142,335.72/196,433.46 = 78,672.24/x
3. Step 3: Cross multiply
   142,335.72x = 196,433.46 × 78,672.24
4. Step 4: Simplify right side
   142,335.72x = 15,453,860,309.15
5. Step 5: Solve for x
   x = 15,453,860,309.15/142,335.72
6. Step 6: Final answer
   x = 108,573.31